You don't.... understand.

.....height....digging depths.....are relative to the centre....so...if I move a few feet....guess what...I am still perpendicular to the surface......lol and that is related to the rotation....relative to a reference point....but....depth....is relative to the centre....not the surface point you start at........so you would curve on every step.....you understand that?

Ie....you don't dig more .... The ground has sunk with you.....see....you cannot use this argument logically....it's a bad shitty argument.

I am not saying it's a globe...I am saying this argument is stupid and full of holes....big ones....

What you should be doing....is building a ramp that goes up.....8 inches per square mile relative to your starting point....not present point.......and then see if you need to walk up hill hahahaha.

In theory it should be flat if built perfectly (but again ...how do you ensure you have maintained a perfect ramp?) if the world is a globe.

I guess you could cut a straight line which has a known depth and apparently follows the curve....then you calculate the apparent volume and you ramp up half the cut with measured amount of filler which should be based on the so called amount of curvature needed.

Then you have a ramp and a remaining half of the cut is empty space. You should now be able to fill the remaining space with the same amount of volume of water ( assuming non porous surfacing) and then it should perfectly fill the pools space.

If the world is flat then the ramp should not be perfect and then result should be more ddirt than water and it would overflow